selftests/seccomp: Check for EPOLLHUP for user_notif
This verifies we're correctly notified when a seccomp filter becomes unused when a notifier is in use. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20200531115031.391515-4-christian.brauner@ubuntu.comSigned-off-by: Kees Cook <keescook@chromium.org>
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